One of the plugs was used to turn the recorder on so it would record the other is the actual microphone connector. Probably NOT a condenser microphone and more probably a crystal or ceramic microphone. The recorder was probably used as a dictating machine.

Vintage! I remember those. Use an 1/8" head phone extension cord on the larger of the two. Then a 1/8" to 1/4" headphone adapter into your mixer. If you have a DI box use that at the end to get it to an XLR input so you don't have to crank the gain on the 1/4" line. That should work.

Ideally you want a mono 1/8" jack to XLR plug with pin 3 tied to pin 1 , but you might have to build that.

OK

Ok thanks for the advice, yea it's battery operated (ECM- 955)

I just wanted to get the strongest signal possible out of it.

you might want to still consider purchasing an actual studio condenser microphone even if manufactured in Russia or China?

Yes, a simple adapter on the large 1/8" plug to a high to low impedance matching transformer would provide you with a studio like microphone albeit rather goofy looking. It won't be able to handle high sound pressure levels. So don't put this on drums or guitar amplifiers. Vocals & acoustic instruments are as far as you are going to get with this microphone. You might also want to put a piece of foam over top of it while doing vocals. But I will tell you that just about any cheap Sony condenser microphone won't sound that different from any of their professional lavalier microphones. So go to it.

Accept no anal adapters.
Ms. Remy Ann David